A girl of Tibetan ethnic group, who studies in Guangzhou, poses for photos with a picture displayed during the exhibition on Tibetan yaks in Guangzhou, capital of south China's Guangdong Province, Dec. 28, 2017. (Xinhua/Liang Xu)

Visitors view a sample of yak head displayed during the exhibition on Tibetan yaks in Guangzhou, capital of south China's Guangdong Province, Dec. 28, 2017. (Xinhua/Liang Xu)